Yoke strap with shock absorber

ABSTRACT

A restraint arrangement for an inflatable slide may comprise a releasable restraint and a yoke coupled to the releasable restraint. The yoke may comprise a first strap and a second strap. A first dampener may be coupled to the first strap. A second dampener may be coupled to the second strap. The first dampener and the second dampener may deform in response to a tensile load.

FIELD

The present disclosure relates to aircraft evacuation assemblies, andmore specifically to restraint devices for evacuation slides and methodsof making an evacuation assembly.

BACKGROUND

An evacuation slide assembly may include an inflatable slide that helpspassengers disembark from an aircraft in the event of an emergency orother evacuation event. The slides may deploy from a door sill or a sideof the aircraft fuselage. The slide deployment is controlled byrestraints placed throughout the length of the slide which release instages in response to internal slide pressure. At an initiation ofinflation, the slide may drop from the door sill creating an impulse onthe primary restraint (i.e., the first restraint to release in a stageddeployment of the evacuation slide). The impulse created by the droppingof the slide may cause the primary restraint to separate prematurely,which can lead to a less than full extension of the evacuation slideand/or an incorrect orientation of a head end of the evacuation slide.

SUMMARY

Disclosed herein, according to various embodiments, is a restraintarrangement for an inflatable slide. A restraint arrangement for aninflatable slide may comprise a releasable restraint. A yoke may becoupled to the releasable restraint. The yoke may comprise a first strapand a second strap. A first dampener may be coupled to the first strap.A second dampener may be coupled to the second strap.

In various embodiments, the first dampener and the second dampener maycomprise an elastic material and may deform in response to a tensileload. The tensile load may be generated by a dropping of the inflatableslide.

In various embodiments, the first dampener may be coupled between afirst portion of the first strap and a second portion of the firststrap, and the second dampener may be coupled between a first portion ofthe second strap and a second portion of the second strap. A third strapmay be coupled between the first portion of the first strap and thesecond portion of the first strap. The first strap may be wrapped aroundthe first dampener. The first dampener may comprise a plurality ofopenings and the first strap may be threaded through the plurality ofopenings.

In various embodiments, the first dampener may comprise at least one ofa central aperture dampener, a semi-circular dampener, a wraparounddampener, a threaded dampener, or a spring dampener. The second dampenermay comprise at least one of a wraparound dampener, a threaded dampener,a semi-circular dampener, or a spring dampener.

In various embodiments, a yoke for an evacuation system is disclosed. Ayoke for an evacuation system may comprise a first strap, a secondstrap, and a first dampener coupled to the first strap.

In various embodiments, the first dampener may comprise an elasticmaterial and may be configured to deform in response to a tensile load.A second dampener may be coupled to the second strap. The yoke mayfurther comprise a third strap. The third strap and the second strap maybe sewn together. The third strap and the second strap may be coupled tothe first dampener. The first dampener may be coupled between a firstportion of the first strap and a second portion of the first strap. Thefirst portion of the first strap may extend through a first opening inthe first dampener and the second portion of the first strap may extendthrough a second opening in the first dampener. A third strap may becoupled to the first portion of the first strap and the second portionof the first strap. The first dampener may comprise at least one of acentral aperture dampener, a semi-circular dampener, a spring dampener,a threaded dampener, or a wraparound dampener.

In various embodiments, a method of making an evacuation assembly isdisclosed. A method of making an evacuation assembly may comprisecoupling a yoke to an evacuation slide, the first yoke comprising afirst strap and a second strap, coupling a first dampener to the firststrap, and coupling a second dampener to the second strap.

The method may further comprise coupling the first dampener and thesecond dampener in series with a releasable restraint. In variousembodiments, at least one of the first dampener or the second dampenermay comprise an elastic material.

The forgoing features and elements may be combined in variouscombinations without exclusivity, unless expressly indicated hereinotherwise. These features and elements as well as the operation of thedisclosed embodiments will become more apparent in light of thefollowing description and accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a perspective view of an evacuation slide in adeployed position, in accordance with various embodiments;

FIG. 2 illustrates a perspective view of an evacuation slide in a stowedposition, in accordance with various embodiments;

FIGS. 3A and 3B illustrate a deployment of an evacuation slide with arestraint arrangement aiding in retaining the evacuation slide in afolded position, in accordance with various embodiments;

FIG. 4 illustrates a restraint arrangement for an evacuation slide, inaccordance with various embodiments;

FIGS. 5A, 5B, and 5C illustrate a restraint arrangement for anevacuation slide, in accordance with various embodiments;

FIGS. 6, 7, 8, and 9 illustrate restraint arrangements for an evacuationslide, in accordance with various embodiments; and

FIG. 10 illustrates a method of making an evacuation assembly, inaccordance with various embodiments.

The subject matter of the present disclosure is particularly pointed outand distinctly claimed in the concluding portion of the specification. Amore complete understanding of the present disclosure, however, may bestbe obtained by referring to the detailed description and claims whenconsidered in connection with the drawing figures, wherein like numeralsdenote like elements.

DETAILED DESCRIPTION

The detailed description of exemplary embodiments herein makes referenceto the accompanying drawings, which show exemplary embodiments by way ofillustration. While these exemplary embodiments are described insufficient detail to enable those skilled in the art to practice theexemplary embodiments of the disclosures, it should be understood thatother embodiments may be realized and that logical changes andadaptations in design and construction may be made in accordance withthis disclosure and the teachings herein. Thus, the detailed descriptionherein is presented for purposes of illustration only and notlimitation. The steps recited in any of the method or processdescriptions may be executed in any order and are not necessarilylimited to the order presented

Furthermore, any reference to singular includes plural embodiments, andany reference to more than one component or step may include a singularembodiment or step. Also, any reference to attached, fixed, connected orthe like may include permanent, removable, temporary, partial, fulland/or any other possible attachment option. Additionally, any referenceto without contact (or similar phrases) may also include reduced contactor minimal contact. Surface cross hatching lines may be used throughoutthe figures to denote different parts but not necessarily to denote thesame or different materials.

Throughout the present disclosure, like reference numbers denote likeelements. Accordingly, elements with like element numbering may be shownin the figures, but may not be necessarily be repeated herein for thesake of clarity.

As used herein, “aft” refers to the direction associated with the tail(i.e., the back end) of an aircraft, or generally, to the direction ofexhaust of the gas turbine. As used herein, “forward” refers to thedirection associated with the nose (i.e., the front end) of an aircraft,or generally, to the direction of flight or motion.

Evacuation slides according to the present disclosure may extend from anaircraft structure, such as, for example, a fuselage or a wing, to anexit surface in a fully deployed position. During deployment, aplurality of restraints and/or yokes may aid in controlling theinflation process of the slide.

With reference to FIG. 1, an exemplary aircraft 100 is shown, inaccordance with various embodiments. Aircraft 100 may comprise afuselage 102 with wing 104 fixed to fuselage 102. An engine 108 may becoupled to an underside of wing 104. An emergency exit door 106 (alsoreferred to herein as a door sill) may be located on fuselage 102,forward wing 104 and engine 108. An evacuation slide 110 may be deployedfrom emergency exit door 106. Evacuation slide 110 may comprise a headend 112 and a toe end 114 opposite head end 112. Head end 112 may becoupled to aircraft 100. Evacuation slide 110 may comprise a slidingsurface 116 (also referred to as a top surface) and a rear surface 118(also referred to as a backside surface) that is opposite slidingsurface 116. Evacuation slide 110 may comprise a forward edge 120 thatis distal to engine 108 and an aft edge 122 that is proximate to engine108. Evacuation slide 110 may comprise an inflatable slide. FIG. 1illustrates evacuation slide 110 in an inflated and/or deployedposition. Evacuation slide 110 may comprise a dual lane slide. However,evacuation slide 110 may comprise any number of lanes. Toe end 114 maybe configured to contact an exit surface in response to evacuation slide110 being deployed.

With reference to FIG. 2, evacuation slide 110 is illustrated in astowed and/or packed position. In this regard, evacuation slide 110 maybe stowed in a packboard 140. In various embodiments, evacuation slide110 may be folded in the stowed position. In various embodiments,evacuation slide 110 may be deployed from packboard 140 in response toopening an emergency exit door. Packboard 140 may be coupled to anaircraft in an installed position. Packboard 140 includes a blow-outpanel which opens in response to deployment of evacuation slide 110, andthrough which the inflatable slide may exit the packboard. In thisregard, evacuation slide 110 may be configured to be deployed from anaircraft.

With reference to FIG. 3A and FIG. 3B, a deployment of evacuation slide110 with a restraint arrangement 170 aiding in retaining evacuationslide 110 in a folded position is illustrated, in accordance withvarious embodiments. In various embodiments, when evacuation slide 110is initially deployed, evacuation slide may be in a folded position andmay include a plurality of folds, including first fold 130 and secondfold 132. A releasable restraint 150 may aid in maintaining first fold130 and/or second fold 132. Releasable restraint 150 may aid in thestaged deployment of evacuation slide 110. Evacuation slide 110 mayunfold in response to releasable restraint 150 separating.

In various embodiments, releasable restraint 150 may be configured toseparate in response to an internal pressure in evacuation slide 110.For example, a gas cylinder may supply a flow of pressurized fluid toevacuation slide 110 in response to evacuation slide 110 being deployed.Evacuation slide 110 may begin to inflate and an internal pressure ofevacuation slide 110 may increase. Releasable restraint 150 may maintainevacuation slide 110 in a folded position until the internal pressurehas increased above a predetermined threshold value. Releasablerestraint 150 may separate once the internal pressure of evacuationslide 110 has increased above the predetermined threshold value.Evacuation slide 110 may unfold in response to releasable restraint 150separating. In this regard, evacuation slide 110 may fully deploy inresponse to releasable restraint 150 separating.

In various embodiments, releasable restraint 150 may include a firstshackle 152 and a second shackle 154. Releasable restraint 150, firstshackle 152, and/or second shackle 154 may be metallic. In variousembodiments, releasable restraint 150 may comprise a shear pinrestraint. In this regard, a first portion 156 of releasable restraint150 may decouple from a second portion 158 of releasable restraint 150in response to a predetermined tensile force illustrated by arrows 160.A first cover 162 and/or a second cover 164 may surround releasablerestraint 150. Second cover 164 may surround at least a portion of firstcover 162. First cover 162 and second cover 164 may comprise a fabric.For example, first cover 162 and second cover 164 may comprise nylon,ballistic nylon, polypropylene, polyester, cotton, or other suitablematerial.

A head-end strap 166 may be coupled to top side surface 116 ofevacuation slide 110 and to releasable restraint 150. Head-end strap 166may be coupled to releasable restraint 150 via second shackle 154. Anend 172 of head-end strap 166 may form a loop through which secondshackle 154 is located. In various embodiments, head-end strap 166 maycomprise a rope, tape, ribbon, webbing, or other suitable strap. Invarious embodiments, head-end strap 166 may comprise nylon, ballisticnylon, polypropylene, polyester, cotton, or other suitable material.

A yoke 180 may be coupled between backside surface 118 of evacuationslide 110 and releasable restraint 150. Yoke 180 may be coupled toreleasable restraint 150 via first shackle 152. Yoke 180 may comprise afirst strap 182, a second strap 184, and a restraint attachment portion186. Restraint attachment portion 186 may be located within first cover162. First strap 182 and second strap 184 may be coupled to releasablerestraint 150 via restraint attachment portion 186. In variousembodiments, first strap 182, second strap 184, and/or restraintattachment portion 186 of yoke 180 may comprise a rope, tape, ribbon,webbing, or other suitable strap. In various embodiments, first strap182, second strap 184, and/or restraint attachment portion 186 of yoke180 may comprise nylon, ballistic nylon, polypropylene, polyester,cotton, or other suitable material.

An end 188 of restraint attachment portion 186 may form a loop throughwhich first shackle 152 is located. First strap 182, second strap 184,restraint attachment portion 186, and/or first cover 162 may be sewntogether at bartack stitch 194. Restraint attachment portion 186 of yoke180 may extend from first shackle 152 to bartack stitch 194. First strap182 may be coupled to a first area 190 on backside surface 118 ofevacuation slide 110 such that first strap 182 extends from bartackstitch 194 to first area 190 of evacuation slide 110. Second strap 184of yoke 180 may be coupled to a second area 192 on backside surface 118of evacuation slide 110, such that second strap 184 extends from bartackstitch 194 to second area 192 of evacuation slide 110. In variousembodiments, first strap 182 and second strap 184 may be sewn, orotherwise attached, to one another at box and cross stitch area 196 andthen sewn as a single unit to restraint attachment portion 186 and/orfirst cover 162 at bartack stitch 194.

In various embodiments, restraint arrangement 170 may comprise a firstdampener 200 coupled to first strap 182 of yoke 180 and a seconddampener 210 coupled to second strap 184 of yoke 180. First dampener 200and second dampener 210 may comprise an elastically deformable memberconfigured deform in response to a tensile load applied to first strap182 and second strap 184, respectively. In various embodiments, thetensile load is generated by the dropping of evacuation slide 110 fromdoor sill 106. As discussed in further detail below, first dampener 200and/or second dampener 210 may comprise any one of a number of dampeningstructures (e.g., a central aperture dampener, a wraparound dampener, asemi-circular dampener, a threaded dampener, or a spring dampener)configured to mitigate an impulse on releasable restraint 150 from thedropping of evacuation slide 110. In various embodiments, first dampener200 may be a section of elastic sewn into the webbing of first strap182, and second dampener 210 may be a section of elastic sewn into thewebbing of second strap 184.

In various embodiments, restraint arrangement 170 may be coupled to aprimary restraint of evacuation slide 110. In other words, evacuationslide 110 may include a plurality of releasable restraints (similar toreleasable restraint 150), which aid in the staged deployment ofevacuation slide 110, and yoke 180 of restraint arrangement 170 may becoupled to the first releasable restraint to separate in the stageddeployment of evacuation slide 110.

First dampener 200 and second dampener 210 may be coupled in series withreleasable restraint 150. First dampener 200 and second dampener 210 maybe in operable communication with releasable restraint 150 and maymitigate an impulse applied to releasable restraint 150 during thedropping evacuation slide 110. For example, evacuation slide 110 fallingfrom door sill 106 generates a tensile load which is applied to yoke180. First dampener 200 and second dampener 210 may elastically deformin response to the tensile load. The deformation of first dampener 200and second dampener 210 may decrease an impulse experienced byreleasable restraint 150, as the deformation of first dampener 200 andsecond dampener 210 may spread the tensile load over a greater amount oftime. Stated another way, deformation of first dampener 200 and seconddampener 210 may increase the time it takes for the full magnitude ofthe tensile force F generated by dropped evacuation slide 110 to beapplied to releasable restraint 150. Stated yet another way, if firstdampener 200 and second dampener 210 were not present a full magnitudeof the tensile force F created by dropped evacuation slide 110 may beapplied to releasable restraint 150 immediately upon the dropping ofevacuation slide 110.

With reference to FIG. 4, a restraint arrangement 270 is illustrated, inaccordance with various embodiments. Restraint arrangement 270 may besimilar to restraint arrangement 170 of FIG. 3A. Restraint arrangement270 may comprise a first central aperture dampener 201. First centralaperture dampener 201 may comprise a central opening 202, a first edgeopening 204, and a second edge opening 206. Edge openings 204 and 206may be disposed proximate a perimeter of first central aperture dampener201. First central aperture dampener 201 may comprise an elasticmaterial. For example, first central aperture dampener 201 may comprisenatural or synthetic rubber, silicone, an elastomer, or any othersuitably elastic material.

Restraint arrangement 270 may further comprise a second central aperturedampener 211. Second central aperture dampener 211 may include a centralopening 212, a first edge opening 214, and a second edge opening 216.Edge openings 214 and 216 may be disposed proximate a perimeter ofsecond central aperture dampener 211. Second central aperture dampener211 may comprise an elastic material. For example, second centralaperture dampener 211 may comprise natural or synthetic rubber,silicone, an elastomer, or any other suitably elastic material.

First central aperture dampener 201 may be coupled between a firstportion 182 a and a second portion 182 b of first strap 182, withmonetary reference to FIG. 4. An end 220 of first portion 182 a may forma first loop 222 through which first central aperture dampener 201 maybe located. In various embodiments, first portion 182 a may be loopedthrough first edge opening 204 and sewn to itself. An end 226 of secondportion 182 b may form a second loop 228 through which first centralaperture dampener 201 may be located. In various embodiments, secondportion 182 b may be looped through second edge opening 206 and sewn toitself.

Second central aperture dampener 211 may be coupled between a firstportion 184 a and a second portion 184 b of second strap 184, withmomentary reference to FIG. 4. An end 230 of first portion 184 a mayform a first loop 232 through which second central aperture dampener 211may be located. In various embodiments, first portion 184 a may belooped through first edge opening 214 and sewn to itself An end 236 ofsecond portion 184 b may form a second loop 238 through which secondcentral aperture dampener 211 may be located. In various embodiments,second portion 184 b may be looped through second edge opening 216 andsewn to itself.

A third strap 240 may be coupled between first portion 182 a and secondportion 182 b. In various embodiments, third strap 240 may be sewn tofirst portion 182 a at stiches 242 and sewn to second portion 182 b atstiches 244. Third strap 240 may be configured as a limiting strap. Forexample, third strap may provide a limit to the deformation of firstcentral aperture dampener 201, such that at a deformation limit of firstcentral aperture dampener 201, third strap 240 acts to transfers tensileloads from first portion 182 a to second portion 182 b. Third strap 240may also provide a redundancy measure. For example, should first centralaperture dampener 201 break prematurely or otherwise become separatedfrom first portion 182 a or second portion 182 b, second portion 182 band first portion 182 a may still be operably connected to one anothervia third strap 240.

A fourth strap 250 may be coupled between first portion 184 a and secondportion 184 b. In various embodiments, fourth strap 250 may be sewn tofirst portion 184 a at stiches 252 and sewn to second portion 184 b atstiches 254. Fourth strap 250 may be configured as a limiting strap. Forexample, fourth strap may provide a limit to the deformation of secondcentral aperture dampener 211, such that at a deformation limit ofsecond central aperture dampener 211, fourth strap 250 acts to transferstensile loads from first portion 184 a to second portion 184 b. Fourthstrap 250 may also provide a redundancy measure. For example, shouldsecond central aperture dampener 211 break prematurely or otherwisebecome separated from first portion 184 a or second portion 184 b,second portion 184 b and first portion 184 a may still be operablyconnected to one via fourth strap 250.

With reference to FIG. 3A, FIG. 3B, and FIG. 4, in various embodiments,first dampener 200 of restraint arrangement 170 may comprise firstcentral aperture dampener 201, and second dampener 210 of restraintarrangement 170 may comprise second central aperture dampener 211. Firstcentral aperture dampener 201 and second central aperture dampener 211may be coupled in series with the releasable restraint 150 attached toyoke 180. First central aperture dampener 201 and second centralaperture dampener 211 may be in operable communication with releasablerestraint 150 to mitigate the impulse applied to releasable restraint150 upon the dropping evacuation slide 110 from door sill 106. Reducingthe impulse on releasable restraint 150 may reduce occurrences ofreleasable restraint 150 separating prematurely and may increase adeployment precision and reliability of evacuation slide 110.

First central aperture dampener 201 and second central aperture dampener211 may be configured to stretch and/or deform in response to a tensileforce and/or impulse being applied to first strap 182 and second strap184, respectively. For example, first central aperture dampener 201 andsecond central aperture dampener 211 may stretch in response to adropping of evacuation slide 110 from door sill 106. First centralaperture dampener 201 and second central aperture dampener 211 may berated for loads greater than the rating of releasable restraint 150.Stated differently, releasable restraint 150 may be configured toseparate at a load which is less than the rated load of first centralaperture dampener 201 and second central aperture dampener 211. Statedyet another way, first central aperture dampener 201 and second centralaperture dampener 211 may be configured to stretch without breakingbefore releasable restraint 150 separates.

With reference to FIGS. 5A, 5B, and 5C, a restraint arrangement 300 isillustrated, in accordance with various embodiments. Restraintarrangement 300 may be similar to restraint arrangement 170 in FIG. 3A.In various embodiments, restraint arrangement 300 includes a wraparounddampener 302 coupled to first strap 182. Wraparound dampener 302 mayinclude an elongated unibody member 301 having a first opening 304located at a first end 306 of wraparound dampener 302 and a secondopening 308 located at a second end 310 of wraparound dampener 302opposite first end 306. First strap 182 of yoke 180 may be disposedthrough first opening 304, wrapped around unibody member 301, anddisposed through second opening 308. Wraparound dampener 302 maycomprise an elastic material. For example, wraparound dampener 302 maycomprise natural or synthetic rubber, silicone, an elastomer, or anyother suitably elastic material. As wraparound dampener 302 stretches inresponse to an impulse (e.g., a dropping of evacuation slide 110), adistance between the portions of first strap 182 wrapped aroundwraparound dampener 302 may become greater.

With reference to FIG. 3A, FIG. 3B, and FIG. 5C, in various embodiments,first dampener 200 of restraint arrangement 170 may comprise wraparounddampener 302. Wraparound dampener 302 may be coupled in series with thereleasable restraint 150 attached to yoke 180. Wraparound dampener 302may be in operable communication with releasable restraint 150 tomitigate the impulse applied to releasable restraint 150 upon thedropping evacuation slide 110 from door sill 106. Reducing the impulseon releasable restraint 150 may reduce occurrences of releasablerestraint 150 separating prematurely and may increase a deploymentprecision and reliability of evacuation slide 110. Wraparound dampener302 may be configured to stretch and/or deform in response to a tensileforce and/or impulse being applied to first strap 182; for example,wraparound dampener 302 may stretch in response to a dropping ofevacuation slide 110 from door sill 106. Wraparound dampener 302 may berated for loads greater than the rating of releasable restraint 150.Stated differently, releasable restraint 150 may be configured toseparate at a load which is less than the rated load of wraparounddampener 302. Stated yet another way, wraparound dampener 302 may beconfigured to stretch without breaking before releasable restraint 150separates. In various embodiments, second dampener 210 of restraintarrangement 170 may comprise a wraparound dampener, similar towraparound dampener 302.

With reference to FIG. 6, a restraint arrangement 320 is illustrated, inaccordance with various embodiments. Restraint arrangement 320 may besimilar to restraint arrangement 170 in FIG. 3A. In various embodiments,restraint arrangement 320 includes a semi-circular dampener 322 coupledto first strap 182. Semi-circular dampener 322 may include asemi-circular member 321 having a first opening 324 located proximate afirst end 326 of semi-circular dampener 322 and a second opening 328located proximate a second end 330 of semi-circular dampener 322opposite first end 326. First strap 182 may be disposed through firstopening 324, around a portion of the circumference of semi-circularmember 321, and through second opening 328. Semi-circular dampener 322may comprise an elastic material. For example, semi-circular dampener322 may comprise natural or synthetic rubber, silicone, an elastomer, orany other suitably elastic material.

With reference to FIG. 3A, FIG. 3B, and FIG. 6, in various embodiments,first dampener 200 of restraint arrangement 170 may comprisesemi-circular dampener 322. Semi-circular dampener 322 may be coupled inseries with the releasable restraint 150 attached to yoke 180.Semi-circular dampener 322 may be in operable communication withreleasable restraint 150 to mitigate the impulse applied to releasablerestraint 150 upon the dropping evacuation slide 110 from door sill 106.Reducing the impulse on releasable restraint 150 may reduce occurrencesof releasable restraint 150 separating prematurely and may increase adeployment precision and reliability of evacuation slide 110.Semi-circular dampener 322 may be configured to stretch and/or deform inresponse to a tensile force and/or impulse being applied to first strap182; for example, semi-circular dampener 322 may stretch in response toa dropping of evacuation slide 110 from door sill 106. Semi-circulardampener 322 may be rated for loads greater than the rating ofreleasable restraint 150. Stated differently, releasable restraint 150may be configured to separate at a load which is less than the ratedload of semi-circular dampener 322. Stated yet another way,semi-circular dampener 322 may be configured to stretch without breakingbefore releasable restraint 150 separates. In various embodiments,second dampener 210 of restraint arrangement 170 may comprise asemi-circular dampener, similar to semi-circular dampener 322.

With reference to FIG. 7, a restraint arrangement 340 is illustrated, inaccordance with various embodiments. In various embodiments, restraintarrangement 340 may be similar to restraint arrangement 170 in FIG. 3A.In various embodiments, restraint arrangement 340 includes a threadeddampener 342 coupled to first strap 182. Threaded dampener 342 mayinclude a unibody member 341 having a plurality of openings 344 formedalong a length of unibody member 341. First strap 182 may be threadedthrough the plurality of openings 344. Threaded dampener 342 maycomprise an elastic material. For example, threaded dampener 342 maycomprise natural or synthetic rubber, silicone, an elastomer, or anyother suitably elastic material.

With reference to FIG. 3A, FIG. 3B, and FIG. 7, in various embodiments,first dampener 200 of restraint arrangement 170 may comprise threadeddampener 342. Threaded dampener 342 may be coupled in series with thereleasable restraint 150 attached to yoke 180. Threaded dampener 342 maybe in operable communication with releasable restraint 150 to mitigatethe impulse applied to releasable restraint 150 upon the droppingevacuation slide 110 from door sill 106. Reducing the impulse onreleasable restraint 150 may reduce occurrences of releasable restraint150 separating prematurely and may increase a deployment precision andreliability of evacuation slide 110. Threaded dampener 342 may beconfigured to stretch and/or deform in response to a tensile forceand/or impulse being applied to first strap 182; for example, threadeddampener 342 may stretch in response to a dropping of evacuation slide110 from door sill 106. Threaded dampener 342 may be rated for loadsgreater than the rating of releasable restraint 150. Stated differently,releasable restraint 150 may be configured to separate at a load whichis less than the rated load of threaded dampener 342. Stated yet anotherway, threaded dampener 342 may be configured to stretch without breakingbefore releasable restraint 150 separates. In various embodiments,second dampener 210 of restraint arrangement 170 may comprise a threadeddampener, similar to threaded dampener 342.

With reference to FIG. 8, a restraint arrangement 360 is illustrated, inaccordance with various embodiments. Restraint arrangement 360 may besimilar to restraint arrangement 170 in FIG. 3A. In various embodiments,restraint arrangement 360 includes a spring dampener 362 coupled tofirst strap 182. Spring dampener 362 may be coupled between firstportion 182 a and second portion 182 b of first strap 182. End 220 offirst portion 182 a may form first loop 222 through which springdampener 362 may be located. In various embodiments, first portion 182 amay be looped through spring dampener 362 and sewn to itself. End 226 ofsecond portion 182 b may form second loop 228 though which springdampener 362 may be located. In various embodiments, second portion 182b may be looped through spring dampener 362 and sewn to itself.

Spring dampener 362 may comprise a compressible coil member 361.Compressible coil member 361 may be configured to regain its originalshape after being compressed or extended. Spring dampener 362 maycomprise an elastic material. For example, spring dampener 362 maycomprise natural or synthetic rubber, silicone, an elastomer, or anyother suitably elastic material. In various embodiments, spring dampener362 may comprise a metal.

A third strap 364 may be coupled between first portion 182 a and secondportion 182 b. In various embodiments, third strap 364 may be sewn tofirst portion 182 a at stiches 242 and sewn to second portion 182 b atstiches 244. Third strap 364 may be configured as a limiting strap. Forexample, third strap 364 may provide a limit to the deformation ofspring dampener 362, such that at a deformation limit of spring dampener362, third strap 364 acts to transfer tensile loads from first portion182 a to second portion 182 b. Third strap 364 may also provide aredundancy measure. For example, should spring dampener 362 breakprematurely or otherwise become separated from first portion 182 a orsecond portion 182 b, second portion 182 b and first portion 182 a maystill be operably connected to one another via third strap 364.

With reference to FIG. 3A, FIG. 3B, and FIG. 8, in various embodiments,first dampener 200 of restraint arrangement 170 may comprise springdampener 362. Spring dampener 362 may be coupled in series with thereleasable restraint 150 attached to yoke 180. Spring dampener 362 maybe in operable communication with releasable restraint 150 to mitigatethe impulse applied to releasable restraint 150 upon the droppingevacuation slide 110 from door sill 106. Reducing the impulse onreleasable restraint 150 may reduce occurrences of releasable restraint150 separating prematurely, and increase a deployment precision andreliability of evacuation slide 110. Spring dampener 362 may beconfigured to stretch and/or deform in response to a tensile forceand/or impulse being applied to first strap 182; for example, springdampener 362 may stretch in response to a dropping of evacuation slide110 from door sill 106. Spring dampener 362 may be rated for loadsgreater than the rating of releasable restraint 150. Stated differently,releasable restraint 150 may be configured to separate at a load whichis less than the rated load of spring dampener 362. Stated yet anotherway, threaded dampener 342 may be configured to stretch without breakingbefore releasable restraint 150 separates. In various embodiments,second dampener 210 of restraint arrangement 170 may comprise a springdampener, similar to spring dampener 362.

With reference to FIG. 9, a restraint arrangement 275 is illustrated, inaccordance with various embodiments. Restraint arrangement 275 maycomprise a yoke 280. Yoke 280 may include a first strap 282 coupled tofirst central aperture dampener 201 and to first cover 162. First strap282 may be coupled to first cover 162 via bartack stitching 196. An end284 of first strap 282 may form a first loop 286, which may be disposedaround first central aperture dampener 201. In various embodiments,first strap 282 may be looped through first edge opening 204 and sewn toitself.

Yoke 280 may include a second strap 290 and a third strap 292. Secondstrap 290 may be coupled to first area 190 on backside surface 118 ofevacuation slide 110, with momentary reference to FIG. 3A. Third strap292 may be coupled to second area 192 on backside surface 118 ofevacuation slide 110, with momentary reference to FIG. 3A. Second strap290 and third strap 292 may be sewn together at stiches 294 and coupledto first central aperture dampener 201 as a single unit. For example, anend 296 of sewn together second strap 290 and third strap 292 may form asecond loop 298, which may be disposed around first central aperturedampener 201. In various embodiments, the sewn together portion ofsecond strap 290 and third strap 292 may be looped through second edgeopening 206 of first central aperture dampener 201 and sewn to itself.

A fourth strap 299 may be coupled between first strap 282 and sewntogether second strap 290 and third strap 292. In various embodiments,fourth strap 299 may be sewn to first strap 282 at stiches 295 and sewnto second strap 290 and third strap 292 at stiches 294. Fourth strap 299may be configured as a limiting strap. For example, fourth strap 299 mayprovide a limit to the deformation of first central aperture dampener201, such that at a deformation limit of first central aperture dampener201, fourth strap 299 acts to transfer tensile loads from first strap282 to second strap 290 and third strap 292. Fourth strap 299 may alsoprovide a redundancy measure. For example, should first central aperturedampener 201 break prematurely or otherwise become separated from firststrap 282 or from sewn together second strap 290 and third strap 292,first strap 282 may still be operably connected to second strap 290 andthird strap 292 via fourth strap 299.

With reference to FIG. 3A, FIG. 3B, and FIG. 9, in various embodiments,restraint arrangement 275 may couple evacuation slide 110 to releasablerestraint 150 within first cover 162. First central aperture dampener201 of restraint arrangement 275 may be coupled in series with thereleasable restraint 150. First central aperture dampener 201 ofrestraint arrangement 275 may be in operable communication withreleasable restraint 150 to mitigate the impulse applied to releasablerestraint 150 upon the dropping evacuation slide 110 from door sill 106.Reducing the impulse on releasable restraint 150 may reduce occurrencesof releasable restraint 150 separating prematurely and may increase adeployment precision and reliability of evacuation slide 110. Firstcentral aperture dampener 201 of restraint arrangement 275 may beconfigured to stretch and/or deform in response to a tensile forceand/or impulse being applied to yoke 280; for example, first centralaperture dampener 201 of restraint arrangement 275 may stretch inresponse to a dropping of evacuation slide 110 from door sill 106. Firstcentral aperture dampener 201 of restraint arrangement 275 may be ratedfor loads greater than the rating of releasable restraint 150. Stateddifferently, releasable restraint 150 may be configured to separate at aload which is less than the rated load of first central aperturedampener 201 of restraint arrangement 275. Stated yet another way, firstcentral aperture dampener 201 of restraint arrangement 275 may beconfigured to stretch without breaking before releasable restraint 150separates.

In various embodiments, a wraparound dampener, a threaded dampener, asemi-circular dampener, or a spring dampener may replace first centralaperture dampener 201 in restraint arrangement 275. Stated another way,a wraparound dampener, a threaded dampener, a semi-circular dampener, ora spring dampener may be coupled between first strap 282 and sewntogether second strap 290 and third strap 292.

With reference to FIG. 10, a method 400 of making an evacuation assemblyis provided, in accordance with various embodiments. The method 400comprises coupling a yoke to an evacuation slide (step 402), coupling afirst dampener to a first strap of the yoke (step 404), and coupling asecond dampener to a second strap of the yoke (step 406). Method 400 mayfurther comprise coupling the first dampener and the second dampener inseries with a releasable restraint (step 408).

In various embodiments, with combined reference to FIG. 3B, FIG. 4, andFIG. 5, step 402 may include coupling yoke 180 to evacuation slide 110.Step 404 may include coupling first dampener 200 to first strap 182.Step 406 may include coupling second dampener 210 to second strap 184.Step 408 may include coupling first dampener 200 and second dampener 210in series with releasable restraint 150.

Benefits, other advantages, and solutions to problems have beendescribed herein with regard to specific embodiments. Furthermore, theconnecting lines shown in the various figures contained herein areintended to represent exemplary functional relationships and/or physicalcouplings between the various elements. It should be noted that manyalternative or additional functional relationships or physicalconnections may be present in a practical system. However, the benefits,advantages, solutions to problems, and any elements that may cause anybenefit, advantage, or solution to occur or become more pronounced arenot to be construed as critical, required, or essential features orelements of the disclosure.

The scope of the disclosure is accordingly to be limited by nothingother than the appended claims, in which reference to an element in thesingular is not intended to mean “one and only one” unless explicitly sostated, but rather “one or more.” It is to be understood that unlessspecifically stated otherwise, references to “a,” “an,” and/or “the” mayinclude one or more than one and that reference to an item in thesingular may also include the item in the plural. All ranges and ratiolimits disclosed herein may be combined.

Moreover, where a phrase similar to “at least one of A, B, and C” isused in the claims, it is intended that the phrase be interpreted tomean that A alone may be present in an embodiment, B alone may bepresent in an embodiment, C alone may be present in an embodiment, orthat any combination of the elements A, B and C may be present in asingle embodiment; for example, A and B, A and C, B and C, or A and Band C. Different cross-hatching is used throughout the figures to denotedifferent parts but not necessarily to denote the same or differentmaterials.

The steps recited in any of the method or process descriptions may beexecuted in any order and are not necessarily limited to the orderpresented. Furthermore, any reference to singular includes pluralembodiments, and any reference to more than one component or step mayinclude a singular embodiment or step. Elements and steps in the figuresare illustrated for simplicity and clarity and have not necessarily beenrendered according to any particular sequence. For example, steps thatmay be performed concurrently or in different order are illustrated inthe figures to help to improve understanding of embodiments of thepresent disclosure.

Any reference to attached, fixed, connected or the like may includepermanent, removable, temporary, partial, full and/or any other possibleattachment option. Additionally, any reference to without contact (orsimilar phrases) may also include reduced contact or minimal contact.Surface shading lines may be used throughout the figures to denotedifferent parts or areas but not necessarily to denote the same ordifferent materials. In some cases, reference coordinates may bespecific to each figure.

Systems, methods and apparatus are provided herein. In the detaileddescription herein, references to “one embodiment”, “an embodiment”,“various embodiments”, etc., indicate that the embodiment described mayinclude a particular feature, structure, or characteristic, but everyembodiment may not necessarily include the particular feature,structure, or characteristic. Moreover, such phrases are not necessarilyreferring to the same embodiment. Further, when a particular feature,structure, or characteristic is described in connection with anembodiment, it is submitted that it is within the knowledge of oneskilled in the art to affect such feature, structure, or characteristicin connection with other embodiments whether or not explicitlydescribed. After reading the description, it will be apparent to oneskilled in the relevant art(s) how to implement the disclosure inalternative embodiments.

Furthermore, no element, component, or method step in the presentdisclosure is intended to be dedicated to the public regardless ofwhether the element, component, or method step is explicitly recited inthe claims. No claim element is intended to invoke 35 U.S.C. 112(f)unless the element is expressly recited using the phrase “means for.” Asused herein, the terms “comprises”, “comprising”, or any other variationthereof, are intended to cover a non-exclusive inclusion, such that aprocess, method, article, or apparatus that comprises a list of elementsdoes not include only those elements but may include other elements notexpressly listed or inherent to such process, method, article, orapparatus.

What is claimed is:
 1. A restraint arrangement for an inflatable slide,comprising: a releasable restraint; a yoke coupled to the releasablerestraint, the yoke comprising a first strap and a second strap; a firstdampener coupled between a first portion of the first strap and a secondportion of the first strap; a second dampener coupled between a firstportion of the second strap and a second portion of the second strap;and a third strap coupled between the first portion of the first strapand the second portion of the first strap.
 2. The restraint arrangementof claim 1, wherein the first dampener and the second dampener comprisean elastic material and deform in response to a tensile load.
 3. Therestraint arrangement of claim 2, wherein the tensile load is generatedby a dropping of the inflatable slide.
 4. The restraint arrangement ofclaim 1, wherein: the first dampener comprises at least one of a centralaperture dampener or a spring dampener; and the second dampenercomprises at least one of a wraparound dampener, a threaded dampener, asemi-circular dampener, or a spring dampener.
 5. A yoke for anevacuation system, comprising: a first strap; a second strap; a firstdampener coupled between a first portion of the first strap and a secondportion of the first strap to the first strap, wherein the first portionof the first strap extends through a first opening in the first dampenerand the second portion of the first strap extends through a secondopening in the first dampener; a second dampener coupled between a firstportion of the second strap and a second portion of the second strap. 6.The yoke of claim 5, wherein the first dampener comprises an elasticmaterial and is configured to deform in response to a tensile load. 7.The yoke of claim 6, further including a third strap, wherein the thirdstrap and the second portion of the first strap are sewn together. 8.The yoke of claim 7, wherein the third strap is coupled to the firstdampener.
 9. The yoke of claim 5, further comprising a third strapcoupled to the first portion of the first strap and the second portionof the first strap.
 10. The yoke of claim 6, wherein the first dampenercomprises at least one of a central aperture dampener, a wraparounddampener, a semi-circular dampener, a threaded dampener, or a springdampener.
 11. A method of making an evacuation assembly, comprising:coupling a yoke to an evacuation slide, the yoke comprising, a firststrap, and a second strap; coupling a first dampener between a firstportion of the first strap and a second portion of the first strap tothe first strap, wherein the first portion of the first strap extendsthrough a first opening in the first dampener and the second portion ofthe first strap extends through a second opening in the first dampenerto the first strap; and coupling a second dampener between a firstportion of the second strap and a second portion of the second strap.12. The method of claim 11, further comprising coupling the firstdampener and the second dampener in series with a releasable restraint.13. The method according to claim 11, wherein at least one of the firstdampener or the second dampener comprises an elastic material.